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관개용 저수지 농업용수의 국가 전과정 목록분석 데이터베이스 구축
김영득,박필주,Kim, Young-Deuk,Park, Pil-Ju 한국농공학회 2011 한국농공학회논문집 Vol.53 No.3
The objective of the study is to develop life cycle inventory (LCI) database of dam, a major facility for irrigation water supply. The types of database developed are three out of nine dams according to the size of the wate r storage capacity: two kinds larger than 500,000 $m^3$ depending on gate for discharging (Type 1) and the other dam smaller than 500,000 $m^3$ (Type 2). According to the LCI analysis, type 1 larger than 500,000 $m^3$ storage capacity with gate has the lowest environment impact in the 6 impact categories. The impact of the type 1 accounts for 7~35 % of the type 2 for supplying irrigation water. Comparing with the environment impacts of water for other uses such as drinking and industrial water, the impacts of 1 $m^3$ irrigation water supply is 4~45 % of the one for industrial water supply and 1~16 % of the drinking water's. The three types of LCI DB on the irrigation water by dams will be useful in the application of Life Cycle Assessment in agricultural products and environmental labelling including carbon footprint since it is complied to the guidelines of LCI DB constr uction issued by Ministry of Environment and Ministry of Knowledge Economy.
급가감속 운전에 따른 듀얼 모노리스형 촉매변환기 내의 유동 균일도와 압력 강하에 관한 수치적 연구
김영득,정수진,김우승,Kim, Young-Deuk,Jeong, Soo-Jin,Kim, Woo-Seung 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.5
The conversion efficiency, durability and pressure drop of the automotive exhaust catalysts are dependent on the flow distribution within the substrate. Conventional porous medium approaches assuming monolith resistance based on the one-dimensional laminar flow for simulating the flow through the automotive exhaust catalysts over-predict the flow uniformity in the monolith. In this study, additional pressure loss is also considered by accounting for entrance effects due to the oblique flow incident on the front face of monolith as a consequence of flow separation and recirculation within the diffuser. The incorporation of an additional pressure loss improves the predictions for the maximum flow velocity within the substrate. An numerical study has also been conducted for the three-dimensional unsteady incompressible non-reacting flow inside various dual-monolith catalytic converters for the rapid acceleration/deceleration driving.
급가감속 운전에 따른 듀얼 모노리스형 촉매변환기 내의 유동 균일도와 압력 강하에 관한 연구
김영득(Young-Deuk Kim),정수진(Soo-Jin Jeong),김우승(Woo-Seung Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Conversion efficiency, durability and pressure drop of automotive exhaust catalysts are dependent on the flow distribution within the substrate. Conventional porous medium approach assuming monolith resistance based on one-dimensional laminar flow for simulating the flow through automotive exhaust catalysts overpredicts the flow uniformity in the monolith. In this study, additional pressure loss accounting for entrance effects due to oblique flow incident on the front face of monolith as a consequence of flow separation and recirculation within the diffuser is considered and incorporation of an additional pressure loss improves the predictions for the maximum flow velocity within the substrate. A numerical study of three-dimensional unsteady incompressible non-reacting flow inside various dual-monolith catalytic converters for the rapid acceleration/deceleration driving has also been conducted.
Twofish 알고리즘을 이용한 저용량 암호화 Chip의 모듈설계
김영득(Young-Deuk Kim),장영조(Young-Jo Jang) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.1A
Twofish 알고리즘은 작은 부피의 로직, Triple-DES보다 강력한 암호화 레벨, 암호화 속도 등을 갖추어 모듈 설계 알고리즘으로 선정하였다. Twofish 알고리즘은 bitwired-XOR, Permutation, S-box, MDS, PHT를 걸치는 H함수를 각기 다른 키로 반복 라운드를 함으로써 대상 데이타를 암호화 한다. 64~256bit의 키 크기와 라운딩 횟수를 조정하여 모듈의 부피나 처리속도를 유동성 있게 조절할 수 있는 장점이 있다. 하드웨어 기기와 응용에 사용하기 위하여 VHDL 모듈로 알고리즘을 설계하고 그 동작을 검증하였다. 구현된 회로는 기존의 방법에 비하여 파이프라인 단계를 적용하므로써 약 23%의 속도 향상을 얻을 수 있었다.
디젤엔진의 NO<SUB>x</SUB> 저감을 위한 SCR DeNO<SUB>x</SUB> 촉매의 정상 및 비정상 성능해석
김영득(Young-Deuk Kim),심성민(Sung-Min Shim),정수진(Soo-Jin Jeong),김우승(Woo-Seung Kim) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The steady- and unsteady-state kinetics of the selective catalytic reduction (SCR) of NOx with NH₃ has been investigated over a commercial V₂O?/TiO₂ catalyst. In order to account for the influence of transport effects the kinetics are coupled with a fully transient two-phase 1D+1D monolith channel model. The Langmuir-Hinshelwood (L-H) and Modified Redox (MR) mechanisms are adopted to describe the steady-state kinetic behavior of the V₂O?/TiO₂ catalyst, and their results are compared with each other. A Temkin-type kinetics is used to describe the ammonia adsorption/desorption rate. The reaction rate expressions are based on previously reported papers and are modified to fit the experimental data. The steady-state chemical reaction schemes used in the present mathematical model have been validated extensively with experimental data over a wide range of reaction temperatures.
백금계 촉매상에서 산화질소(NO)의 산화 반응속도에 관한 실험 및 모델링 연구
김영득(Young-Deuk Kim),이정길(Jung-Gil Lee),심성민(Sung-Min Shim),박정권(Jung-Kwon Park),오세두(Se-Doo Oh),강정호(Jung-Ho Kang),정수진(Soo-Jin Jeong),김우승(Woo-Seung Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
To improve the NOx conversion over a SCR (selective catalytic reduction) catalyst, the DOC (diesel oxidation catalyst) is usually placed upstream of the SCR catalyst to enhance the fast SCR reaction (4NH₃+2NO+2NO₂→4N₂+6H₂O) using equimolar amounts of NO and NO₂. Here, a ratio of NO₂/NOx above 50% should be avoided, because the reaction with NO₂ only (4NH₃+4NO+O₂→4N₂+6H₂O) is slower than the standard SCR reaction (4NH₃+4NO+O₂→4N₂+6H₂O). In order to accurately predict the performance characteristics of SCR catalysts, it is therefore desired to develop a more simple and reliable mathematical and kinetic models on the oxidation kinetics of nitric oxide over a DOC. In the present work, the prediction accuracy and limit of three different chemical reaction kinetics models are presented to describe the chemicophysical characteristics and conversion performance of DOCs. Steady-state experiments with DOCs mounted on a light-duty four-cylinder 2.0-L turbocharged diesel engine then are performed, using an engine-dynamometer system to calibrate the kinetic parameters such as activation energies and pre-exponential factors of heterogeneous reactions. The reaction kinetics for NO oxidation over Pt-based catalysts is determined in conjunction with a transient one-dimensional (1D) heterogeneous plug-flow reactor (PFR) model with diesel exhaust gas temperatures in the range of 115-525℃ and space velocities in the range of (0.4-6.5)×10?h?¹.